one said:The video in the first post shows realtime demo in which Sonic and all the effects are controlled realtime on a PS3 devkit. The supposed "Xbox 360 version" is from the trailer montage for an Xbox 360 conference. Can it be a proof of, say, 60fps on Xbox 360? Or rather, is it really the Xbox 360 version in the first place? I'm just not sure about it, especially when its release date is set some time in 2006.
The first time it was seen was at E3 among a montage of Sega games which started with Chrome Hounds which is a 360 exclusive, and included 2 other 360 games.
BTW, we can lay the subject to rest:
http://media.xbox360.ign.com/media/749/749072/vids_1.html
Realtime on 360 hardware.